VARIABLE ERROR CORRECTION IN MULTIPOINT-TO-POINT COMMUNICATION USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING
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United States of America Patent
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app pub date -
May 16, 2007
filing date -
May 20, 1996
priority date (Note) -
Abandoned
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Abstract
Variable error correction for a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a system comprises: a host unit; a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using OFDM; wherein the host unit allocates orthogonal tones within the system to the plurality of remote units; wherein the host unit sends an adjustment signal to at least one of the remote units instructing the at least one remote unit to adjust the timing of transmissions from the at least one remote unit to improve orthogonality of an OFDM waveform received at the host unit; and wherein at least one of the remote units transmits an upstream OFDM signal to the host unit using variable error correction in which the remote unit applies at least one of a plurality of available levels of error correction.
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